Three distinct errors were created on this single pane of the 2001 Pan-American Exposition Centennial stamps. A shift of the color intaglio printing resulted in three stamps being produced as color-missing errors. The stamp pane was examined by the American Philatelic Expertizing Service (APEX).

By Linn’s staff

It's time to catch up on the week that was in stamp-collecting insights and news.

Linn’s Stamp News is looking back at its five most-read stories of the week.